CH 9 Specialty Testing

• What is the size of the area of the central cornea which the keratometer measures?

  3mm
• Moving the eyepiece of the keratometer back and forth when focusing causes what?

  The accommodative system to be stimulated resulting in an incorrect setting
• What do you need to do if the horizontal bars of the plus sign are not aligned?

  Rotate the axis grip
• When recording the Keratometry reading, the horizontal power reading is taken from what side of the instrument?


  left
• When recording the keratometry reading, the vertical power reading is taken from what side of the instrument?

  Right
• T/F a person with a low or normal pressure reading does not have glaucoma

  False
• How is the mire positioned when the cornea is properly centered and applanated

  The inner edges of the semicircle touch
• Which tonometer has the advantage of being portable, fast, and comfortable to hold?

  Tono pen
• What instrument is used to test visual acuity under different lighting conditions

  Brightness acuity tester (BAT)
• The potential acuity meter is used to determine the potential acuity of a patient who has?

  Cataracts
• What is the fundus made up of?

  Retina, optic disk, retinal vessels
• What type of ultrasonography is used to determine the length of the eyeball

  A-scan
• What type of ultrasonography is used to detect tumors in the eye?


  B-Scan
• When should corneal topography measurements be preformed?

  Prior to refractive procedures, like LASIK
• What is the pachymeter used for?


  Measuring corneal thickness
• T/F in order for a GDx or HRT to be performed, the pt must have dilating drops instilled?

  False